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As an object falls freely toward Earth, th object's momentum

As an object falls freely toward Earth, th object's momentum

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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RevieWestios 134. As an object falls freely toward Earth, the object's momentum (1) decreases (2) increases (3) remains the same 140. During which time interval is the velocity of the object constant? 141. Determine the net impulse imparted to the object during the 6-second time interval. 135. Which term identifies a scalar quantity? 142. What is the magnitude of the net force acting on a 2.0 x 103³-kilogram car as it accelerates from rest to a speed of 15 meters per second in 5.0 seconds? (1) acceleration (2) momentum (3) speed (4) displacement 136. What is the magnitude of the velocity of a 25-kilogram object that has a momentum of 100. kilogram - meters per second? (1) 0.25 m/s (2) 2500 m/s (1) 6.0 x 10³ N (2) 2.0 × 10ª N (3) 3.0 × 104 N (4) 6.0 × 10ª N (3) 40. m/s (4) 4.0 m/s 143. A 5.00-kilogram mass is traveling at 100. meters per second. Determine the speed of the mass after an impulse with a magnitude of 30.0 newton • seconds is applied. 137. What is the momentum of a 1,200-kilogram car traveling at 15 meters per second due east? (1) 80. kg m/s due east (2) 80. kg · m/s due west (3) 1.8 x 104 kg m/s due east (4) 1.8 x 104 kg m/s due west 138. A constant unbalanced force acts on an object for 3.0 seconds, producing an impulse of 6.0 newton • seconds east. Determine the magnitude and direction of the force. 144. A 2,400-kilogram car is traveling at a speed of 20. meters per second. Compared to the magnitude of the force required to stop the car in 12 seconds, the magnitude of the force required to stop the car in 6.0 seconds is (1) half as great (2) twice as great (3) the same (4) four times as great 139. A 10.-newton force to the east acts on an object for 0.010 second. What force to the east, acting on the object for 0.050 second, would produce the same impulse? 145. A 2.0-kilogram cart moving due east at 6.0 meters per second collides with a 3.0-kilogram cart moving due west. The carts stick together and come to rest after the collision. Calculate the initial speed of the 3.0-kilogram cart. (1) 1.0 N (2) 2.0 N (3) 5.0N (4) 10. N Base your answers to questions 140 and 141 on the graph below, which represents the relationship between the net force acting on an object and the time during which the force acts. 146. A 0.180-kilogram cart traveling at 0.80 meter per second to the right collides with a 0.100-kilogram cart initially at rest. The carts lock together upon collision. Calculate the final velocity of the carts. Force vs. Time 147. A 2.0-kilogram cart traveling north at 4.0 meters per second collides head on with a 1.0-kilogram cart traveling south at 8.0 meters per second. What is the magnitude of the total momentum of the two carts immediately after the collision? 3 1 (1) 0.0 kg · m/s (2) 8.0 kg m/s (3) 16 kg · m/s (4) 32 kg m/s 1 2 3 4 5 6 Time (s) Topic 2: Mechanics 55 Force (N)
Transcribed Image Text:RevieWestios 134. As an object falls freely toward Earth, the object's momentum (1) decreases (2) increases (3) remains the same 140. During which time interval is the velocity of the object constant? 141. Determine the net impulse imparted to the object during the 6-second time interval. 135. Which term identifies a scalar quantity? 142. What is the magnitude of the net force acting on a 2.0 x 103³-kilogram car as it accelerates from rest to a speed of 15 meters per second in 5.0 seconds? (1) acceleration (2) momentum (3) speed (4) displacement 136. What is the magnitude of the velocity of a 25-kilogram object that has a momentum of 100. kilogram - meters per second? (1) 0.25 m/s (2) 2500 m/s (1) 6.0 x 10³ N (2) 2.0 × 10ª N (3) 3.0 × 104 N (4) 6.0 × 10ª N (3) 40. m/s (4) 4.0 m/s 143. A 5.00-kilogram mass is traveling at 100. meters per second. Determine the speed of the mass after an impulse with a magnitude of 30.0 newton • seconds is applied. 137. What is the momentum of a 1,200-kilogram car traveling at 15 meters per second due east? (1) 80. kg m/s due east (2) 80. kg · m/s due west (3) 1.8 x 104 kg m/s due east (4) 1.8 x 104 kg m/s due west 138. A constant unbalanced force acts on an object for 3.0 seconds, producing an impulse of 6.0 newton • seconds east. Determine the magnitude and direction of the force. 144. A 2,400-kilogram car is traveling at a speed of 20. meters per second. Compared to the magnitude of the force required to stop the car in 12 seconds, the magnitude of the force required to stop the car in 6.0 seconds is (1) half as great (2) twice as great (3) the same (4) four times as great 139. A 10.-newton force to the east acts on an object for 0.010 second. What force to the east, acting on the object for 0.050 second, would produce the same impulse? 145. A 2.0-kilogram cart moving due east at 6.0 meters per second collides with a 3.0-kilogram cart moving due west. The carts stick together and come to rest after the collision. Calculate the initial speed of the 3.0-kilogram cart. (1) 1.0 N (2) 2.0 N (3) 5.0N (4) 10. N Base your answers to questions 140 and 141 on the graph below, which represents the relationship between the net force acting on an object and the time during which the force acts. 146. A 0.180-kilogram cart traveling at 0.80 meter per second to the right collides with a 0.100-kilogram cart initially at rest. The carts lock together upon collision. Calculate the final velocity of the carts. Force vs. Time 147. A 2.0-kilogram cart traveling north at 4.0 meters per second collides head on with a 1.0-kilogram cart traveling south at 8.0 meters per second. What is the magnitude of the total momentum of the two carts immediately after the collision? 3 1 (1) 0.0 kg · m/s (2) 8.0 kg m/s (3) 16 kg · m/s (4) 32 kg m/s 1 2 3 4 5 6 Time (s) Topic 2: Mechanics 55 Force (N)
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